[Share] Set reader view to "Zoom to Page Height"

[thalient-ai]

Description

At this time, Zotero does not have the option to change the default view for PDF reader windows and tabs. The default view is "Zoom by Page Width". If you want to change the view, you manually set it for each PDF.

This script automatically changes the view of the PDF reader to "Zoom by Page Height" instead of "Zoom by Page Width". You can adjust the script to use other views supported by PDF.js including "page-width", "page-fit", and "auto".

The script works on both PDF Reader Tabs and Windows. You can configure Zotero to open PDFs in windows instead of tabs in the settings.

Set the event to "Open File" to execute the script automatically when a PDF is opened.

Event

Open File

Operation

Script

Data

/**
 * This script changes the view to "Zoom by Page Height"
 * @thalient-ai
 * @link https://github.com/windingwind/zotero-actions-tags/discussions/378
 * @see https://github.com/thalient-ai/zotero-scripts/blob/main/zotero_default_zoom/src/actionandtag_default_zoom
 */

// This script sets the zoom of PDF reader tabs or windows to "Zoom by Page Height"

(function () {
  const Zotero = require("Zotero");
  const Zotero_Tabs = require("Zotero_Tabs");

  async function adjustPDFZoom() {
    try {
      Zotero.log("Script execution started.");

      // Increased initial delay to ensure the PDF reader and Zotero objects are fully initialized
      await Zotero.Promise.delay(750); // Adjust delay as needed for your environment

      let reader = null;

      // Check if the PDF is opened in a tab
      if (Zotero_Tabs.selectedID) {
        Zotero.log("PDF opened in a tab.");
        reader = Zotero.Reader.getByTabID(Zotero_Tabs.selectedID);
        if (reader) {
          Zotero.log("Reader found in tab with tabID: " + Zotero_Tabs.selectedID);
        }
      }

      // If not found in a tab, check if the PDF is opened in a window
      if (!reader) {
        Zotero.log("Checking for reader in a window...");

        // Get all window readers from _readers
        let windowReaders = Zotero.Reader._readers.filter(
          (r) => r._internalReader && r._internalReader._primaryView
        );

        if (windowReaders.length > 0) {
          Zotero.log("Found window reader states. Total readers: " + windowReaders.length);

          // Select the last reader in the list (most recently opened)
          reader = windowReaders[windowReaders.length - 1];
          Zotero.log("Targeting the most recently opened reader window.");

          if (!reader) {
            Zotero.logError("Most recent reader object not found.");
            return;
          }
        } else {
          Zotero.logError("No window reader states found.");
          return;
        }
      }

      // Apply zoom setting if reader is found
      if (reader) {
        if (!reader._internalReader || !reader._internalReader._primaryView) {
          Zotero.logError("Internal reader not initialized.");
          return;
        }

        let primaryView = reader._internalReader._primaryView;
        let pdfViewer =
          primaryView._iframeWindow.PDFViewerApplication.pdfViewer;

        if (pdfViewer) {
          // Handle different layout modes
          let spreadMode = pdfViewer.spreadMode; // 0: No Spread, 1: Odd Spreads, 2: Even Spreads
          Zotero.log(`Current spread mode: ${spreadMode}`);

          // Apply "page-height" zoom to all pages in the layout
          pdfViewer.currentScaleValue = "page-height";

          // Log success message
          Zotero.log(`Zoom set successfully for spread mode: ${spreadMode}`);
        } else {
          Zotero.logError("PDF viewer not found.");
        }
      } else {
        Zotero.logError("Reader not found or not accessible.");
      }
    } catch (error) {
      Zotero.logError(`Failed to set zoom mode: ${error.message}`);
    }
  }

  // Execute the zoom adjustment function
  adjustPDFZoom();
})();

Anything else

Modifying tabs is straightforward. Modifying windows is more complicated. A delay of 750ms was added to support the "Open File" trigger and ensure it overrides the automatic setting of the view. You can adjust the delay if needed, but know that some files take longer to initialize than others delaying the automatic view adjustment.

[thalient-ai]

In addition to the "Open File" trigger, you can manually execute the script via the Reader Menu setting

[luxueqiang]

hi, how can we set odd spreads at the same time?

[thalient-ai]

hi, how can we set odd spreads at the same time?

Updated to support Odd and Even spreads

[datcu-octavian]

hello, thanks for that! Any idea how to set odd/even spreads too?

[thalient-ai]

Updated to support Odd and Even spreads